<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @copyright   Copyright (c) 2014 X.commerce, Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

namespace Magento\Framework\Css\PreProcessor;

use Magento\Framework\Css\PreProcessor\AdapterInterface;
use Magento\Framework\View\Asset\PreProcessorInterface;

class Less implements PreProcessorInterface
{
    /**
     * @var \Magento\Framework\Less\FileGenerator
     */
    protected $fileGenerator;

    /**
     * @var AdapterInterface
     */
    protected $adapter;

    /**
     * @param \Magento\Framework\Less\FileGenerator $fileGenerator
     * @param AdapterInterface $adapter
     */
    public function __construct(
        \Magento\Framework\Less\FileGenerator $fileGenerator,
        AdapterInterface $adapter
    ) {
        $this->fileGenerator = $fileGenerator;
        $this->adapter = $adapter;
    }

    /**
     * {@inheritdoc}
     */
    public function process(\Magento\Framework\View\Asset\PreProcessor\Chain $chain)
    {
        $chain->setContentType('less');
        $tmpLessFile = $this->fileGenerator->generateLessFileTree($chain);
        $cssContent = $this->adapter->process($tmpLessFile);
        $cssTrimmedContent = trim($cssContent);
        if (!empty($cssTrimmedContent)) {
            $chain->setContent($cssContent);
            $chain->setContentType('css');
        }
    }
}
